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Consolidated Subsidiaries - Summary of Financial Information of Consolidated Subsidiaries (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets ₩ 246,807,795 ₩ 239,714,965  
Total liabilities 205,444,962 202,450,215  
Sales 92,578,265 87,476,410 ₩ 70,546,024
Profit (loss) for the period 3,621,968 (4,716,144) ₩ (24,429,108)
Korea Hydro & Nuclear Power Co., Ltd.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 72,508,359 70,535,018  
Total liabilities 47,082,862 45,660,916  
Sales 13,447,880 10,798,378  
Profit (loss) for the period 567,267 151,638  
Korea South-East Power Co., Ltd.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 13,203,109 13,158,245  
Total liabilities 6,447,903 6,964,695  
Sales 6,527,922 7,761,713  
Profit (loss) for the period 382,336 196,522  
Korea Midland Power Co., Ltd.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 14,849,596 15,309,205  
Total liabilities 9,513,087 10,368,698  
Sales 7,088,426 7,611,821  
Profit (loss) for the period 225,196 (1,844)  
Korea Western Power Co., Ltd.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 13,309,836 12,710,246  
Total liabilities 7,708,730 7,648,441  
Sales 6,193,922 6,915,233  
Profit (loss) for the period 361,725 126,519  
Korea Southern Power Co., Ltd.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 13,184,059 13,405,076  
Total liabilities 7,101,465 7,807,334  
Sales 6,430,487 7,298,989  
Profit (loss) for the period 311,530 226,811  
Korea East-West Power Co., Ltd.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 12,287,969 11,683,112  
Total liabilities 5,592,569 5,626,034  
Sales 5,322,832 5,571,885  
Profit (loss) for the period 467,885 139,013  
KEPCO Engineering & Construction Company, Inc.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 945,384 854,704  
Total liabilities 367,910 307,396  
Sales 553,363 545,092  
Profit (loss) for the period 58,513 32,654  
KEPCO Plant Service & Engineering Co., Ltd.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 1,675,776 1,585,380  
Total liabilities 355,479 318,597  
Sales 1,534,269 1,523,031  
Profit (loss) for the period 170,967 161,849  
KEPCO Nuclear Fuel Co., Ltd.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 1,060,367 1,101,960  
Total liabilities 562,604 622,157  
Sales 397,595 284,066  
Profit (loss) for the period 48,061 43,533  
KEPCO KDN Co., Ltd.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 846,361 733,434  
Total liabilities 222,119 301,713  
Sales 781,646 738,833  
Profit (loss) for the period 215,791 65,495  
KEPCO International HongKong Ltd.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 149,757 133,915  
Total liabilities 1,611 0  
Sales 0 0  
Profit (loss) for the period 7,596 8,795  
KEPCO International Philippines Inc.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 13,720 72,830  
Total liabilities 78 0  
Sales 0 0  
Profit (loss) for the period 40,427 4,891  
KEPCO Gansu International Ltd.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 8,233 7,226  
Total liabilities 693 608  
Sales 0 0  
Profit (loss) for the period (5) (23)  
KEPCO Philippines Holdings Inc.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 202,810 180,592  
Total liabilities 173 96  
Sales 0 0  
Profit (loss) for the period 49,999 8,802  
KEPCO Philippines Corporation      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 2,990 2,607  
Total liabilities 4 0  
Sales 0 0  
Profit (loss) for the period 120 127  
KEPCO Ilijan Corporation      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 58,752 142,711  
Total liabilities 615 800  
Sales 0 0  
Profit (loss) for the period 4,549 3,718  
KEPCO Neimenggu International Ltd.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 323,519 284,280  
Total liabilities 4,839 4,346  
Sales 0 0  
Profit (loss) for the period 10,891 15,021  
KEPCO Shanxi International Ltd.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 811,971 707,447  
Total liabilities 366,377 329,539  
Sales 0 0  
Profit (loss) for the period 13,677 (3,875)  
KOMIPO Global Pte Ltd.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 454,052 411,249  
Total liabilities 2,716 32,900  
Sales 0 0  
Profit (loss) for the period 15,618 17,174  
KEPCO Netherlands B.V.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 155,632 141,088  
Total liabilities 109 45  
Sales 0 0  
Profit (loss) for the period 4,237 3,856  
KEPCO Australia Pty., Ltd.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 226 749  
Total liabilities 0 34  
Sales 0 0  
Profit (loss) for the period (4,017) 131  
KOSEP Australia Pty., Ltd.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 55,461 79,308  
Total liabilities 7,847 7,990  
Sales 31,935 29,675  
Profit (loss) for the period 10,139 10,665  
KOMIPO Australia Pty., Ltd.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 94,760 86,077  
Total liabilities 3,214 4,014  
Sales 31,935 29,676  
Profit (loss) for the period 6,253 9,248  
KOWEPO Australia Pty., Ltd.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 93,353 86,074  
Total liabilities 2,736 3,571  
Sales 31,935 29,675  
Profit (loss) for the period 4,978 9,001  
KOSPO Australia Pty., Ltd.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 39,606 32,828  
Total liabilities 3,221 3,923  
Sales 31,935 29,675  
Profit (loss) for the period 8,768 10,329  
KEPCO Middle East Holding Company      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 136,740 121,015  
Total liabilities 129,721 107,611  
Sales 0 0  
Profit (loss) for the period (7,668) (1,548)  
Qatrana Electric Power Company      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 554,387 491,627  
Total liabilities 207,773 208,707  
Sales 28,465 26,779  
Profit (loss) for the period 24,062 20,949  
KHNP Canada Energy Ltd.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 180,220 155,242  
Total liabilities 20,431 12,379  
Sales 0 0  
Profit (loss) for the period 506 392  
KEPCO Bylong Australia Pty., Ltd.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 45,420 44,557  
Total liabilities 552,861 465,231  
Sales 0 0  
Profit (loss) for the period (69,620) (16,669)  
Korea Waterbury Uranium Limited Partnership      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 20,773 20,772  
Total liabilities 62 44  
Sales 0 0  
Profit (loss) for the period (142) (67)  
KEPCO Holdings de Mexico      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 670 1,171  
Total liabilities 3,025 2,621  
Sales 0 0  
Profit (loss) for the period (1,032) (121)  
KST Electric Power Company, S.A.P.I. de C.V.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 654,086 631,348  
Total liabilities 532,766 490,470  
Sales 67,656 93,843  
Profit (loss) for the period 24,713 19,657  
KEPCO Energy Service Company      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 2,257 2,028  
Total liabilities 1,198 716  
Sales 9,361 10,193  
Profit (loss) for the period 146 251  
KEPCO Netherlands S3 B.V.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 81,554 70,613  
Total liabilities 19,084 16,710  
Sales 0 0  
Profit (loss) for the period 978 1,769  
PT. KOMIPO Pembangkitan Jawa Bali      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 18,014 17,303  
Total liabilities 3,684 3,929  
Sales 21,567 23,639  
Profit (loss) for the period 969 1,579  
PT. Cirebon Power Service      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 3,004 2,936  
Total liabilities 823 714  
Sales 10,515 9,457  
Profit (loss) for the period 586 672  
KOWEPO International Corporation      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 0 0  
Total liabilities 11 10  
Sales 0 0  
Profit (loss) for the period 0 0  
KOSPO Jordan LLC      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 36,620 19,387  
Total liabilities 22,271 3,881  
Sales 17,477 17,665  
Profit (loss) for the period 4,312 7,082  
EWP America Inc.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 49,381 [1] 46,954 [2]  
Total liabilities 3,120 [1] 4,032 [2]  
Sales 14,888 [1] 14,549 [2]  
Profit (loss) for the period 332 [1] 895 [2]  
KNF Canada Energy Limited      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 2,337 2,261  
Total liabilities 30 34  
Sales 0 0  
Profit (loss) for the period (67) (56)  
EWP Barbados 1 SRL      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 469,387 434,690  
Total liabilities 1,463 14,217  
Sales 0 2,448  
Profit (loss) for the period 28,937 36,566  
Gyeonggi Green Energy Co., Ltd.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 160,060 180,176  
Total liabilities 226,650 214,822  
Sales 60,769 80,630  
Profit (loss) for the period (31,941) (28,549)  
PT. Tanggamus Electric Power      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 232,963 214,892  
Total liabilities 155,119 150,483  
Sales 6,136 2,127  
Profit (loss) for the period 4,216 (2,230)  
Gyeongju Wind Power Co., Ltd.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 87,987 90,616  
Total liabilities 41,547 49,982  
Sales 18,550 19,807  
Profit (loss) for the period 5,817 6,716  
KOMIPO America Inc.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets [3] 633,218 579,403  
Total liabilities [3] 328,237 318,295  
Sales [3] 18,806 39,323  
Profit (loss) for the period [3] 9,662 3,376  
PT. EWP Indonesia      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 101,015 90,650  
Total liabilities 84 132  
Sales 0 0  
Profit (loss) for the period 6,115 9,590  
KEPCO Netherlands J3 B.V.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 174,130 153,324  
Total liabilities 15,748 13,634  
Sales 0 0  
Profit (loss) for the period 7,378 15,289  
Korea Offshore Wind Power Co., Ltd.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 336,687 334,444  
Total liabilities 131,463 143,827  
Sales 41,489 40,313  
Profit (loss) for the period 14,607 6,497  
Global One Pioneer B.V.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 150 143  
Total liabilities 64 44  
Sales 0 0  
Profit (loss) for the period (130) (85)  
Global Energy Pioneer B.V.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 363 336  
Total liabilities 69 44  
Sales 0 0  
Profit (loss) for the period (131) (81)  
Mira Power Limited      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 443,556 403,843  
Total liabilities 332,629 318,557  
Sales 4,213 2,683  
Profit (loss) for the period 11,499 (1,590)  
KOSEP Material Co., Ltd.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 6,111 4,974  
Total liabilities 539 542  
Sales 5,016 4,834  
Profit (loss) for the period 1,108 908  
Commerce and Industry Energy Co., Ltd.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 65,954 73,671  
Total liabilities 25,841 29,611  
Sales 35,054 33,050  
Profit (loss) for the period (3,638) (2,901)  
KEPCO KPS Philippines Corp.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 6,403 5,775  
Total liabilities 594 884  
Sales 7,372 4,608  
Profit (loss) for the period 422 97  
KOSPO Chile SpA      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 186,200 166,643  
Total liabilities 83,705 75,619  
Sales 0 0  
Profit (loss) for the period (1,185) 0  
PT. KOWEPO Sumsel Operation and Maintenance Services      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets   26  
Total liabilities   260  
Sales   0  
Profit (loss) for the period   0  
Hee Mang Sunlight Power Co., Ltd.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 5,875 5,877  
Total liabilities 2,355 2,403  
Sales 567 689  
Profit (loss) for the period 46 202  
Fujeij Wind Power Company      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 245,967 216,082  
Total liabilities 171,610 158,081  
Sales 0 0  
Profit (loss) for the period 14,962 15,067  
KOSPO Youngnam Power Co., Ltd.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 371,946 360,026  
Total liabilities 257,626 255,761  
Sales 412,037 410,173  
Profit (loss) for the period 10,275 (7,965)  
Chitose Solar Power Plant LLC      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 93,435 98,911  
Total liabilities 78,709 84,228  
Sales 14,453 14,447  
Profit (loss) for the period 2,553 2,059  
KEPCO Solar Co., Ltd.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 240,555 246,273  
Total liabilities 29,240 36,127  
Sales 20,788 23,234  
Profit (loss) for the period 6,210 8,367  
KOSPO Power Services Ltda.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 8,118 6,976  
Total liabilities 6,363 7,086  
Sales 17,005 17,634  
Profit (loss) for the period 1,924 (211)  
Energy New Industry Specialized Investment Private Investment Trust      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets [4] 483,585 454,888  
Total liabilities [4] 3,358 3,364  
Sales [4] 0 24,030  
Profit (loss) for the period [4] 22,608 10,812  
KOEN Bylong Pty., Ltd.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 15 11  
Total liabilities 165 128  
Sales 0 0  
Profit (loss) for the period (12) 0  
KOMIPO Bylong Pty., Ltd.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 15 13  
Total liabilities 172 147  
Sales 0 0  
Profit (loss) for the period (17) (20)  
KOWEPO Bylong Pty., Ltd.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 15 12  
Total liabilities 168 142  
Sales 0 0  
Profit (loss) for the period (17) (43)  
KOSPO Bylong Pty., Ltd.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 202 388  
Total liabilities 425 541  
Sales 0 0  
Profit (loss) for the period (57) (20)  
EWP Bylong Pty., Ltd.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 15 13  
Total liabilities 13 13  
Sales 0 0  
Profit (loss) for the period 2 46  
KOWEPO Lao International      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 17,335 13,038  
Total liabilities 2,247 223  
Sales 11,891 10,270  
Profit (loss) for the period 4,823 6,268  
KEPCO Mangilao Holdings LLC      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 99,669 90,445  
Total liabilities 52,732 41,898  
Sales 810 775  
Profit (loss) for the period (7,804) 785  
Mangilao Investment LLC      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 224,646 206,714  
Total liabilities 18 15  
Sales 0 0  
Profit (loss) for the period 0 (1)  
KEPCO Mangilao Solar, LLC      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 226,509 206,600  
Total liabilities 247 1,918  
Sales 16,907 13,593  
Profit (loss) for the period 3,634 826  
Jeju Hanlim Offshore Wind Co., Ltd.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 590,613 459,229  
Total liabilities 524,640 388,171  
Sales 10,872 0  
Profit (loss) for the period (5,067) (3,032)  
PT. Siborpa Eco Power      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 13,877 12,209  
Total liabilities 3 3  
Sales 0 0  
Profit (loss) for the period (38) (52)  
PT. Korea Energy Indonesia      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 9,146 1,878  
Total liabilities 5,524 101  
Sales 4,550 1,897  
Profit (loss) for the period 1,171 132  
KOLAT SpA      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 49,452 46,958  
Total liabilities 406 352  
Sales 2,880 2,237  
Profit (loss) for the period 1,090 1,820  
KEPCO California, LLC      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 52,627 46,606  
Total liabilities 7,464 6,823  
Sales 645 613  
Profit (loss) for the period (507) (385)  
KEPCO Mojave Holdings, LLC      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 101,912 93,233  
Total liabilities 90,646 78,328  
Sales 0 0  
Profit (loss) for the period (3,950) (3,901)  
Incheon Fuel Cell Co., Ltd.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 249,022 259,169  
Total liabilities 233,049 237,409  
Sales 91,097 96,924  
Profit (loss) for the period (5,805) (4,112)  
KOEN Service Co., Ltd.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 10,072 11,470  
Total liabilities 7,186 8,745  
Sales 39,482 38,164  
Profit (loss) for the period 323 305  
KOMIPO Service Co., Ltd.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 8,123 7,944  
Total liabilities 4,728 4,777  
Sales 38,415 37,525  
Profit (loss) for the period 657 960  
KOWEPO Service Co., Ltd.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 8,422 10,300  
Total liabilities 6,678 6,584  
Sales 40,875 36,421  
Profit (loss) for the period 314 264  
KOSPO Service Co., Ltd      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 7,199 6,122  
Total liabilities 4,593 4,182  
Sales 32,422 30,369  
Profit (loss) for the period 949 703  
EWP Service Co., Ltd.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 5,291 5,487  
Total liabilities 3,851 3,790  
Sales 27,101 26,767  
Profit (loss) for the period 27 176  
PT. KOMIPO Energy Indonesia      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 5,177 2,983  
Total liabilities 1,273 250  
Sales 6,433 2,023  
Profit (loss) for the period 874 38  
KNF Partners Co., Ltd.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 2,875 2,589  
Total liabilities 1,182 1,106  
Sales 6,700 6,380  
Profit (loss) for the period 286 340  
KOSPO USA Inc.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 725,984 378,732  
Total liabilities 321 377  
Sales 0 0  
Profit (loss) for the period (6,099) (6,351)  
KOSPO Niles LLC (formerly, Nambu USA LLC)      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 326,651 297,370  
Total liabilities 51 230  
Sales 0 0  
Profit (loss) for the period 9,947 (732)  
Tamra Offshore Wind Power Co., Ltd.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 112,747 120,460  
Total liabilities 74,809 83,161  
Sales 19,937 18,570  
Profit (loss) for the period 1,551 1,089  
KEPCO MCS Co., Ltd.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 94,305 111,189  
Total liabilities 67,881 73,940  
Sales 292,011 307,146  
Profit (loss) for the period (9,033) (4,757)  
KEPCO FMS Co., Ltd.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 16,330 21,310  
Total liabilities 18,815 18,142  
Sales 108,560 107,336  
Profit (loss) for the period 1,126 1,895  
Firstkeepers Co., Ltd.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 24,800 18,698  
Total liabilities 13,930 12,437  
Sales 95,836 90,575  
Profit (loss) for the period 4,546 2,689  
Secutec Co., Ltd.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 17,416 16,038  
Total liabilities 11,980 11,797  
Sales 78,011 72,284  
Profit (loss) for the period 1,968 699  
SE Green Energy Co., Ltd.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 126,012 147,251  
Total liabilities 93,330 114,737  
Sales 41,251 40,326  
Profit (loss) for the period 178 (1,305)  
Mangilao Intermediate Holdings LLC      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 230,079 206,771  
Total liabilities 126,833 114,954  
Sales 0 0  
Profit (loss) for the period (1,277) (5,293)  
KEPCO CSC Co., Ltd.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 17,430 15,985  
Total liabilities 11,516 12,170  
Sales 49,443 49,502  
Profit (loss) for the period 2,944 2,644  
KOAK Power Limited      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 16,961 15,000  
Total liabilities 322 528  
Sales 0 0  
Profit (loss) for the period (75) 714  
KOMIPO Europe B.V.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 84,899 86,109  
Total liabilities 123 69  
Sales 890 1,183  
Profit (loss) for the period (6,403) 109  
Haenanum Energy Fund      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 7,415 7,415  
Total liabilities 3 3  
Sales 493 47  
Profit (loss) for the period 445 (1)  
Paju Ecoenergy Co., Ltd.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 61,836 60,653  
Total liabilities 2,635 2,146  
Sales 16,306 15,351  
Profit (loss) for the period 697 (357)  
Guam Ukudu Power LLC      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 940,137 749,837  
Total liabilities 960,812 720,795  
Sales 112,782 0  
Profit (loss) for the period (39,280) (19,904)  
K-SOLAR SHINAN Co., Ltd.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 279,204 298,866  
Total liabilities 263,030 281,676  
Sales 34,148 37,137  
Profit (loss) for the period 907 (6,896)  
KPS Partners Co., Ltd.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 4,264 3,503  
Total liabilities 2,298 1,776  
Sales 14,053 12,921  
Profit (loss) for the period 487 183  
KEPCO E&C Service Co., Ltd.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 8,437 7,167  
Total liabilities 1,738 1,938  
Sales 16,861 16,454  
Profit (loss) for the period 1,578 1,505  
Moha Solar Co., Ltd.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 25,946 27,213  
Total liabilities 28,391 29,363  
Sales 0 0  
Profit (loss) for the period (273) 112  
Ogiri Solar Power Co., Ltd.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 1,077 1,032  
Total liabilities 21 31  
Sales 77 0  
Profit (loss) for the period 55 (9)  
KHNP USA LLC      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 2,170 1,517  
Total liabilities 400 140  
Sales 1,196 1,142  
Profit (loss) for the period 186 166  
KOMIPO Vanphong Power Service LLC      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 39,147 26,819  
Total liabilities 3,592 3,768  
Sales 26,235 21,396  
Profit (loss) for the period 9,951 10,879  
Energy Innovation Fund I      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 40,554 43,725  
Total liabilities 894 419  
Sales 0 0  
Profit (loss) for the period (899) (766)  
KHNP Chile SpA      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 6,081 5,555  
Total liabilities 4,818 4,219  
Sales 0 0  
Profit (loss) for the period (60) (66)  
Yeong Yang Apollon Photovoltaic Co., Ltd.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 1,422 1,529  
Total liabilities 1,324 1,427  
Sales 194 219  
Profit (loss) for the period (4) 42  
Yeong Yang Corporation Co., Ltd.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 1,403 1,519  
Total liabilities 1,314 1,418  
Sales 190 216  
Profit (loss) for the period (12) 39  
SolarVader Co., Ltd      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 1,413 1,529  
Total liabilities 1,317 1,421  
Sales 195 219  
Profit (loss) for the period (12) 40  
Yeong Yang Innovation Co., Ltd      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 1,407 1,510  
Total liabilities 1,314 1,418  
Sales 188 210  
Profit (loss) for the period 1 32  
Yeong Yang Horus Photovoltaic Co., Ltd.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 1,395 1,502  
Total liabilities 1,314 1,418  
Sales 184 206  
Profit (loss) for the period (3) 28  
Yeong Yang Solar Management Co., Ltd.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 1,415 1,540  
Total liabilities 1,318 1,420  
Sales 198 224  
Profit (loss) for the period (23) 46  
LSG Hydro Power Limited      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 629 717  
Total liabilities 12 8  
Sales 0 0  
Profit (loss) for the period (187) (219)  
KOEN Bio Co., Ltd.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 1,179 1,010  
Total liabilities 683 585  
Sales 1,570 2,467  
Profit (loss) for the period 90 372  
KOMIPO Iberian Solar Group, S.L.U.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 76,858 79,666  
Total liabilities 69,709 66,874  
Sales 0 0  
Profit (loss) for the period (3,786) (931)  
Jeongam Wind Power Co., Ltd.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 70,772 75,744  
Total liabilities 60,170 63,219  
Sales 7,094 8,154  
Profit (loss) for the period (2,113) (958)  
KOWEPO Europe B.V.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 35 107  
Total liabilities 3,511 3,177  
Sales 0 0  
Profit (loss) for the period (181) (44,685)  
Yeongdeok Sunrise Wind Power Co., Ltd.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 112,863 94,615  
Total liabilities 87,437 74,842  
Sales 7,717 0  
Profit (loss) for the period 3,555 (383)  
KA Power Limited      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 6,620 3,173  
Total liabilities 3,375 172  
Sales 0 0  
Profit (loss) for the period (207) 126  
Western Power Changgi Solar Co., Ltd.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 43,393 46,950  
Total liabilities 36,938 40,815  
Sales 6,461 7,036  
Profit (loss) for the period 321 2,011  
EWP Australia Pty., Ltd.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 67,756 52,734  
Total liabilities 358 0  
Sales 0 325  
Profit (loss) for the period 12,457 337  
Columboola Solar Farm Hold Co Pty., Ltd.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets [5] 342,603 311,259  
Total liabilities [5] 222,480 213,822  
Sales [5] 8,349 10,072  
Profit (loss) for the period [5] 20,622 3,217  
Digital Innovation Growth Fund      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 11,989 11,624  
Total liabilities 172 96  
Sales 0 0  
Profit (loss) for the period 1,745 (266)  
J Wind First, LLC      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 54,456 52,304  
Total liabilities 54,456 52,304  
Sales 2,992 2,540  
Profit (loss) for the period 0 0  
KEPCO Holding Company      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 3,727 3,307  
Total liabilities 0 0  
Sales 0 0  
Profit (loss) for the period (35) (23)  
KEPCO for Maintenance Company      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 12,192 118  
Total liabilities 10,078 0  
Sales 2,726 0  
Profit (loss) for the period 1,838 (45)  
KOSPO Trumbull LLC      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 336,425 25  
Total liabilities 0 0  
Sales 0 0  
Profit (loss) for the period 0 (10)  
Changjuk Wind Power Co., Ltd.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 25,434 24,364  
Total liabilities 2,815 3,049  
Sales 5,983 6,230  
Profit (loss) for the period 686 744  
Chile Solar JV SpA      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 96,796 98,705  
Total liabilities 81,288 75,472  
Sales 9,862 9,050  
Profit (loss) for the period (5,411) (2,768)  
KEPCO KPS South Africa Pty., Ltd.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 10,784 9,222  
Total liabilities 4,688 4,236  
Sales 19,713 8,512  
Profit (loss) for the period 266 834  
KOWEPO Holding Limited      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 9,108 1,323  
Total liabilities 888 1,371  
Sales 0 0  
Profit (loss) for the period 7,679 (49)  
KEPCO ES Co., Ltd.      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 318,648 322,529  
Total liabilities 6,087 15,367  
Sales 6,384 14,151  
Profit (loss) for the period 8,758 ₩ 5,384  
KOSPO Rutile, LLC      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 147    
Total liabilities 0    
Sales 0    
Profit (loss) for the period 0    
Sprott Chile Solar I SpA      
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]      
Total assets 8,682    
Total liabilities 27    
Sales 0    
Profit (loss) for the period ₩ 1    
[1] Financial information of EWP America Inc. includes that of 4 other subsidiaries, EWP Renewable Corporation, California Power Holdings LLC, EWP ESS Holdings, LLC, and Fairhaven ESS LLC.
[2] Financial information of EWP America Inc. includes that of 4 other subsidiaries, EWP Renewable Corporation, and California Power Holdings LLC, EWP ESS Holdings, LLC, and Fairhaven ESS LLC.
[3] Financial information of KOMIPO America Inc. includes that of 17 other subsidiaries including Elara Equity Holdings, LLC and CVS Equity Holdings, LLC.
[4] Financial information of Energy New Industry Specialized Investment Private Investment Trust includes that of 6 other subsidiaries, BSK E-New Industry Fund VII, e-New Industry LB Fund 1, Songhyun e-New Industry Fund, BSK E-New Industry Fund X, UI Carbon-Neutrality Fund, and Magna Energy New Industrial Fund.
[5] Financial information of Columboola Solar Farm Hold Co Pty., Ltd. includes that of 3 other subsidiaries including Columboola Solar Farm Nominees Pty., Ltd.